摘要
以二元函数为例讨论了f″xy(x0,y0)=f″yx(x0,y0)成立的条件,给出了两个比现行教材更弱的f″xy(x0,y0)=f″yx(x0,y0)成立的充分条件.
Using a bivariable function as an example, the proper conditions of f″_(xy)(x_0,y_0)=f″_(yx)(x_0,y_0) are discussed, and two sufficient conditions of the function that are weaker than any conditions in actual teaching materials are given.
出处
《吉林化工学院学报》
CAS
2004年第3期101-102,共2页
Journal of Jilin Institute of Chemical Technology
关键词
充分条件
求导次序
交换
sufficient condition
sequence of solving the derivation
exchange
